What is Duo and How Does it Work?

Duo is a two-factor authentication (2FA) method that requires users to provide two forms of identification to access a system or application. The two factors can be something you know (like a password or PIN) and something you have (like a physical token or a smartphone app).

Duo provides an additional layer of security beyond just a password, which can help prevent unauthorized access to systems and data. It is commonly used in businesses and organizations to protect sensitive information and systems.

Some common examples of duo include:

1. A password and a physical token (like a smart card or a one-time password device)
2. A password and a biometric identifier (like a fingerprint or facial recognition)
3. A password and a mobile app (like Duo Mobile)
4. A password and a hardware token (like a USB key)

Duo is often used in conjunction with other security measures, such as firewalls and intrusion detection systems, to provide an additional layer of protection against cyber threats.